Alphachannel

AGS · 25 August 2014, 18:55

Hi,

I am trying to display image data with alphachannel. It seems like the cybergraphics.library ignores the alpha data. Is this true? Tested with os 3.1 and 4.1!

Code:

		movem.w oxO_left(a3),d3-d4	; dest x y
		
		moveq	#3,d5
		moveq	#7,d6
		
		moveq	#0,d0			; x in source
		moveq	#0,d1			; y in source
		moveq	#12,d2			; Bytes per row in source
		moveq	#RECTFMT_RGBA,D7

testpicture	dc.l	$FF000088,$00FF0088,$0000FF88
		dc.l	$FF000077,$00FF0077,$0000FF77
		dc.l	$FF000066,$00FF0066,$0000FF66
		dc.l	$FF000055,$00FF0055,$0000FF55
		dc.l	$FF000044,$00FF0044,$0000FF44
		dc.l	$FF000033,$00FF0033,$0000FF33
		dc.l	$FF000022,$00FF0022,$0000FF22

thomas · 25 August 2014, 20:27

Quote:

Originally Posted by AGS

It seems like the cybergraphics.library ignores the alpha data. Is this true?

Yes.

AGS · 25 August 2014, 20:29

Ok, thanks, time for a workaround. Any ideas? I could read a line into my own buffer and calc the alpha by myself, then write the line back? Is there a better way to perform this?

25 August 2014, 20:29	#3
AGS XoXo/Tasko Developer Join Date: Dec 2013 Location: Munich Age: 48 Posts: 450	Ok, thanks, time for a workaround. Any ideas? I could read a line into my own buffer and calc the alpha by myself, then write the line back? Is there a better way to perform this?

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)